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Babelfish for PostgreSQL is an open source project available under the Apache 2.0 and PostgreSQL licenses. It provides the capability for PostgreSQL to understand queries from applications written for Microsoft SQL Server. Babelfish understands the SQL Server wire-protocol and T-SQL, the Microsoft SQL Server query language, so you don’t have to switch database drivers or re-write all of your application queries. With Babelfish, applications currently running on SQL Server can now run directly on PostgreSQL with fewer code changes.
https://babelfishpg.org/